In a Nodejs application I’m using the Sequelize ORM to write records to a mysql database. Every table has a createdAt field by default, but that only records datetime with seconds:

mysql> SELECT createdAt FROM ticks LIMIT 3;
+---------------------+
| createdAt           |
+---------------------+
| 2017-11-08 16:34:21 |
| 2017-11-08 16:34:15 |
| 2017-11-08 16:34:27 |
+---------------------+
3 rows in set (0.00 sec)

Since I’m running a very time sensitive service I would also like to record milliseconds. In the docs I found the data types, which includes:

Sequelize.DATE(6)  // DATETIME(6) for mysql 5.6.4+. Fractional seconds support with up to 6 digits of precision

I never explicitly write the createdAt field though (Sequelize does that automagically), so I’m not sure how I could make that write milliseconds.

Could anybody point me in the right direction to save records with the createdAt field using millisecond precision? All tips are welcome!

You can define createdAt explicitly in your model, for example:

id: {
    type: Sequlieze.INTEGER(11).UNSIGNED,
    autoIncrement: true,
    primaryKey: true
},
...
...
createdAt: {
    type: schema.DATE(6),
    allowNull: true,
    defaultValue: Sequelize.fn('NOW')
}

Or rename it by:

created_ts: {
    type: schema.DATE(6),
    allowNull: true,
    defaultValue: Sequelize.fn('NOW')
}, {
    createdAt: created_ts
}